Ballpoint pen with oil filled upper part



FIG. 1 is a right side elevation view of the ballpoint pen with oil filled upper part which is the subject of my new design, the left side elevation view being a mirror image thereof;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevation view of a second embodiment of my new design, the left side elevation view being a mirror image thereof;

FIG. 7 is a front elevation view thereof;

FIG. 8 is a rear elevation view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a bottom plan view thereof. 

The ornamental design for a ballpoint pen with oil filled upper part, as shown and described. 